When one person prematurely trys to open the passenger door on a vehicle while the driver simultaneously trys to unlock the door, causing it to relock and keep the passenger outside.
"Hey man let me in the car already, it's cold out here!"
"I've been trying to, but you've lockblocked me like 5 times in a row now!"
The act or reactive measure when the opposite sex makes eye-contact with you and then proceeds to plug in their iPod as a defense mechanism to prevent you from making a move on them.
Josh: I saw this girl on the bus and was going to hit on her, then she busted out her iPod.
The phenomenon that occurs when someone is trying to open a car door while someone else is trying to unlock the door at the same, resulting in a still locked door. Followed by repeated attempts and pointing and laughing.
Person waiting for the door to unlock: Hey Rick, unlock the door already, you bastard.
Person with the keys: I would, if you kept your crab covered hand off the handle and stopped lockblocking me.